abbreviated designation "Cons." commends itself. This system we conceive
to be similar in its mechanical characteristics to the perception system
P, hence excitable by qualities and incapable of retaining the trace of
changes, _i.e._ it is devoid of memory. The psychic apparatus which,
with the sensory organs of the P-system, is turned to the outer world,
is itself the outer world for the sensory organ of Cons.; the
teleological justification of which rests on this relationship. We are
here once more confronted with the principle of the succession of
instances which seems to dominate the structure of the apparatus. The
material under excitement flows to the Cons, sensory organ from two
sides, firstly from the P-system whose excitement, qualitatively
determined, probably experiences a new elaboration until it comes to
conscious perception; and, secondly, from the interior of the apparatus
itself, the quantitative processes of which are perceived as a
qualitative series of pleasure and pain as soon as they have undergone
certain changes.

The philosophers, who have learned that correct and highly complicated
thought structures are possible even without the coöperation of
consciousness, have found it difficult to attribute any function to
consciousness; it has appeared to them a superfluous mirroring of the
perfected psychic process. The analogy of our Cons. system with the
systems of perception relieves us of this embarrassment. We see that
perception through our sensory organs results in directing the
occupation of attention to those paths on which the incoming sensory
excitement is diffused; the qualitative excitement of the P-system
serves the mobile quantity of the psychic apparatus as a regulator for
its discharge. We may claim the same function for the overlying sensory
organ of the Cons. system. By assuming new qualities, it furnishes a new
contribution toward the guidance and suitable distribution of the mobile